A Chess Game

A man who had never won a game of chess with his friend, one day bet him that he could simultaneously play two chess games with him, and either win one of the games or draw both of them. He made only one stipulation, which was that they alternate their moves on two separate chess boards and that on one board he got to play black while on the other board he got to play white. He said that he was so confident that he would win this bet that he would let his friend play first. His friend accepted the challenge. How was the man able to win this bet?